Harvard SAT and IQ: How much regression towards the mean?

Is the SAT an IQ test? Blog commenter Lion of the Judah-sphere has claimed that the SAT does not correlate as well with comprehensive IQ tests as said IQ tests correlate with one another. At first I assumed he was wrong, but my recent analysis suggesting Harvard undergrads have an average Wechsler IQ of 122, really…

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Explicating reliability

One may talk of a reliable car. “Reliable” here clearly means a car that has a high success rate of doing what it is supposed to (e.g. getting one where one wants to go in a reasonable time). One may also talk of a reliable source of information, that is, an authority. Can we understand…

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